| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
| Cc: | Tatsuro Yamada <tatsuro(dot)yamada(dot)tf(at)nttcom(dot)co(dot)jp>, Julien Rouhaud <rjuju123(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: list of extended statistics on psql |
| Date: | 2020-08-30 16:33:29 |
| Message-ID: | 20200830163329.GA21915@alvherre.pgsql |
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| Lists: | pgsql-hackers |
On 2020-Aug-30, Tomas Vondra wrote:
> On Sat, Aug 29, 2020 at 06:43:47PM -0400, Alvaro Herrera wrote:
> > On 2020-Aug-29, Tomas Vondra wrote:
> > > Also, it might be useful to show the size of the statistics built, just
> > > like we show for \d+ etc.
> >
> > \dX+ I suppose?
>
> Right. I've only used \d+ as an example of an existing command showing
> sizes of the objects.
Yeah, I understood it that way too.
How can you measure the size of the stat objects in a query? Are you
thinking in pg_column_size()?
I wonder how to report that. Knowing that psql \-commands are not meant
for anything other than human consumption, maybe we can use a format()
string that says "built: %d bytes" when \dX+ is used (for each stat type),
and just "built" when \dX is used. What do people think about this?
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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